This was one of my endless search. Atlast got some answers related to detachment. Felt like sharing the same and here are few points.

1. Even a fickle mind can be brought under control by the force of constant practice and detachment.  -  Lord Krishna
Here, practice implies incessant striving and repeated efforts. It's just like kids learning to write a few simple words and when they grow up, they just key in long passages effortlessly and fluently.
And, now coming to detachment. Does it mean sannyasa - renunciation? NO. Detachment means remaining aloof from all other temptations and attractions while striving to fulfil a chosen aim. That is, to retain interest and concern for the work in hand alone and to remain unconcerned about everything else - this is detachment. Since the goal of monks is self-realization, they have to renounce all the worldly things. And since the word 'detachment' has come to mean renunciation, whenever it is used today it is understood as becoming a monk and retiring to the forests. But this is not correct. Anyone engaged in accomplishing a particular goal is detached from other things to some extent.

2. The concentration that is developed through faith and love is the most natural; it involves no struggle and no strain.

3. 'Eka' is 'One'; 'agra' is 'tip'. Hence, 'Ekagrata' or 'Concentration' implies 'being one-pointed', putting all resources together in one place. Concentration of the mind is bringing all the scattered mental forces together and channelising the attention towards one object or aim.